PDF malware analysis — malicious · d6a439a3ff09ff2b

MALICIOUS

PDF

89.2 KB Created: 2021-09-02 06:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: e53ebd70130e58b4813829d7425cc36c SHA-1: 2e3c3fc9ca57d7ef349f088feba08ce0c6c63bc0 SHA-256: d6a439a3ff09ff2bbdd84795380ea8c942d144c469435e2c1991f2e6a6334679

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The file's structure and URL patterns are consistent with a malicious PDF used as a lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9954

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM

PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://phuocthuan.vn/images/pic/file/31698220083.pdf In PDF document text
- http://asijskepotraviny.cz/files/file/13017815332.pdfIn PDF document text
- http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/vinanurujokekubovu.pdfIn PDF document text
- http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a4483ab90---3186721555.pdfIn PDF document text
- https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f67f9378ad---64136552887.pdfIn PDF document text
- http://beloezoloto.ru/userfiles/file/4582787238.pdfIn PDF document text
- http://sarlampa.ru/upload_picture/82948480341.pdfIn PDF document text
- https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac692479a3b---39160703979.pdfIn PDF document text
- http://parkhighclassof60.com/clients/871169/File/nimijubuxamatizut.pdfIn PDF document text
- http://markone-tools.com/upload/files/menabuvisavadebagazilize.pdfIn PDF document text
- http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091bcade926f---fedusexiwasipomaj.pdfIn PDF document text
- http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d3493dc1a---8711982723.pdfIn PDF document text
- https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/7a708ec122b1250084cd6a4bbf1c6175/toraretisopover.pdfIn PDF document text
- https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a93478d77e---3760189518.pdfIn PDF document text
- http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079304655586---5458484152.pdfIn PDF document text
- https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/121f40007309edd07bcc60f48a218ad0/devirisolu.pdfIn PDF document text
- http://mathcountsoutreach.org/userfiles/file/558146878.pdfIn PDF document text
- http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607759dbbbae4---minifaz.pdfIn PDF document text
- http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd6018840f---xejam.pdfIn PDF document text
- https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/c0cea72e6da898c9ce7eaf17d7b449b4/62414378921.pdfIn PDF document text
- http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096200060c85---20770122417.pdfIn PDF document text
- http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079c54a3d4ac---muniwaputo.pdfIn PDF document text
- https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd46f82236---kuxowasigatafakiberawav.pdfIn PDF document text
- https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/76duntljfkcohl8ir8t1jk3ns7/mozisobekadatizer.pdfIn PDF document text
- https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/6nojiir16q9fs24t1u9jf49s2l/nogosopefisutopabazajov.pdfIn PDF document text
- https://workinhotel.com/upload/fckfile/juzexowo.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=in+text+citation+without+datePDF link annotation
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f6e1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF6E1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010ef3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10EF3	18760 bytes
SHA-256: `d77225379e35e86de48f8e86b8471a023799a69f968d46167cfc32f7a99907f1`
`font_02_sfnt_off00013f1a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13F1A	10392 bytes
SHA-256: `7db8a85dad8b06b4484a759a5c4a93f20db053136666fbf892a9a073d9df13b4`

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